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Messages - Rogerborg

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1
LF250 / Re: Rusty exhaust pipe
« on: January 03, 2011, 01:45:55 PM »
And at 7000km, 25 months and 1.5 winters, the rear pipe on my LF250B has rotted through and is blowing. >:(

I'd put some high temperature paint on, but it was already too far gone.  Now I'll have to take the rear pipe off, and do a proper bodge job on it.  If you have an LF250B and live in a damp climate, you need to sort this issue out.

2
LF250 / Re: Xenon bulb for the LF250
« on: October 25, 2010, 04:31:33 AM »
Agreed - headlights are generic parts.  Treat the bike as a collection of parts, and don't sweat trying to get an exact replacement. 

If you do want to replace like-for-like, and ChineseMotorcyclePartsOnline don't have the Lifan part, then many Yamaha XVS250 parts should fit.


3
LF250 / Re: 18 tooth front sprocket: thumbs up
« on: October 25, 2010, 04:26:32 AM »
Ah, interesting.  Got any details on what exactly you removed?  On my Huoniao 125, I just chopped out the sections of the exhaust with the cats in and welded in straight pipe. 

I haven't actually investigated the Lifan's exhaust yet to see where the cat is, or considered how I'd remove it.  Any hints you can give would be much appreciated.

4
LF250 / Anyone know what main jet is in the LF250B?
« on: September 13, 2010, 01:51:42 AM »
Before I start stripping, can anyone provide info on what carb and jet I should expect to find?  I believe the Yamaha XV250 has a Mikuni 26mm carb with a 110 main jet as standard, but I can't even confirm that for certain.  My bike is running lean; is anyone running a custom jetting solution?

5
LF250 / 18 tooth front sprocket: thumbs up
« on: September 05, 2010, 01:19:42 AM »
The standard sprockets on our bike are 16 front, 45 rear.  I felt this gave it too low a gearing, so just swapped the front for an 18 tooth.  I'm definitely liking it - no problems pulling away in 1st, 2nd has a more usable range (no more going round roundabouts in 3rd), and 5th is still good at an (actual) 30mph.  The engine doesn't feel strained or struggling, and it makes good use of the low down torque that we enjoy.

One thing it hasn't done is increase the top speed.  I'm still topping out at an (actual) 65mph.  I suspect that's down to the convoluted cat exhaust strangling the engine, but will try up-jetting first before I start hacking up the exhaust.

I bought this sprocket (UK seller) listed as for a "1995-1997" Virago, type "569" (c.f. JT569) but with 18 teeth (+2).  It fits just fine, and there was plenty of slack in the chain to get the larger sprocket fitted.

Something to note is that it's a 520 sprocket, as on the original Yahama. For some reason, the stock sprockets and chain on our bikes are 530 (same pitch, but wider). However, a 520 sprocket is fine with a 530 chain, as long as you stay on top of the alignment, and I'll be changing the chain and rear to 520 anyway when I replace them.

6
LF250 / Re: No sparks...help anyody
« on: July 24, 2010, 12:41:34 PM »
Presumably his bike cut out again in the middle of nowhere and he didn't make it home...

7
LF400 / Re: Lifan LF 400
« on: July 05, 2010, 07:45:52 AM »
Oh, darn and drat.  Motorbike Warehouse were selling them in the UK, but they appear to have stopped (or are at least out of stock).  I know that our daft licensing categories aren't kind to 400s, but I really hope to see more of these great bikes in the UK rather than fewer.

8
LF250 / Re: No sparks...help anyody
« on: July 05, 2010, 02:56:07 AM »
There's a Yamaha XV250 manual online here.

Does your model have a side stand cutout switch?  If so, that's the first thing I'd check.  Pop it off, give it a good clean, check the condition of the wiring, and try bypassing it - sorry, I don't know which wires to short, but there won't be that many combinations to try.

If I can hear you cheering from up here in Glasgow, I'll know that's sorted it. ;)

9
Damn good advice from Pat!

I checked the clearances on my 18 month old 5900km LF250B today, and they were all tight.  The rear exhaust valve had virtually no clearance.  I've adjusted them generously: a sloppy 0.1mm on the inlet and 0.15mm on the exhaust, slightly more than recommended, but it's better to be over than under.  The bike now idles noticeably more easily, and faster too - a good sign when you haven't adjusted anything else.  There's some healthy valve chatter now from cold - it was ominously quiet beforehand.  Read this carefully:

IF YOUR ENGINE IS QUIET WHEN IT'S COLD, THIS IS NOT A GOOD THING!

Performance when cold seems slightly down, but that's also a good thing: the clearances should only shrink (and thus give maximum valve opening) when the engine is hot.  If you've got a quiet, powerful engine from cold, then it's likely cooking its valves when it's hot.

As Pat says, is a fairly big job, with a lot to come off before you can get at the values: several hours done solo, with some fairly tight access issues to deal with.  There's nothing particularly complicated though, and one thing I'd note though is that you can unbolt the fuel valve and remove it along with the tank: no need to clamp anything off.

The tank is a tight fit to get back on though, so I can see that it'd be easy to trap the fuel lines.

Also, I just couldn't see the timing marks on the flywheel, no matter how much light I shone in there.  However, it's not rocket science to find TDC on the compression stroke for each cylinder.  Turn the engine counter-clockwise, watch for the inlet valve opening and closing, then you can just shine a light in the spark plug hole and watch for the piston reaching its highest point.

Something else I noticed was that the rubber inlet manifold (above the carb, under the tank) was already perished and split.  This is on a 18 month old bike!  I glooped it with some silicone sealant, but I'll have to keep an eye on that.  There was also some slight tearing on the rubber at the back of the air cleaner box, which I've also bodged with gloop.

If you've got an LF250 and you're not confident checking the valve clearances yourself, I'd recommend paying someone to do it for you.  It's could end up costing you a lot more later if you don't.

10
Chit Chat / Re: help again
« on: May 20, 2010, 06:19:18 AM »
Hi Abilene.  Sorry, I'm not familiar with any particular problem with the C250 starters, so I'm afraid it'll need some diagnosis.  

1) Are your lights working OK when the engine isn't running?  If not, then it's likely that your main fuse has blown, and that the bike is running off of the alternator, rather than the battery.  You can just replace the fuse (it should be under the seat, near to the battery +ve terminal) and away you go.

2) Find the starter motor casing.  I don't know exactly where it's placed on your engine, but it should be a fat cylinder on top of the crankcase.  Find the terminals on it.  Check them for corrosion, or loose wires.

3) OK, so the wiring and terminals seem sound, and so you've got lights, but no starter.  It's time to buy yourself a cheap multimeter (or a 12v voltage tester), for a few $$$.  A multimeter is a great investment, and really quite easy to use - YouTube has plenty of "how to use a multimeter" instructionals.

You'll want to use it to check for voltage at the following places:

3.1) Across the battery terminals.  This is a double check that it's not just a dead battery, and to check that you're using the meter correctly.  You should see 12.5V or so. ;)

3.2) Across the starter terminals when you press the starter button.  If there's voltage across the terminals but the starter doesn't turn, then the fault is internal to the starter and it needs to be stripped or replaced.

3.3) If there's no voltage across the starter terminals, then you'll have to trace the wiring back and see if you can find the problem.  Next port of call is the starter switch itself.  With the switch not pressed, there should be 12V between one of the starter switch terminals and earth (the bike's chassis).  If there's no voltage at either switch terminal, then the wiring between the battery and the starter switch is faulty - you'll just have to trace it back to find the break.

3.4) With the starter switch pressed, you should have 12V (between the terminal and earth) at both switch terminals.  Alternatively, use the continuity (aka diode) mode on the multimeter to check for continuity across the starter switch terminals with the switch pressed.  If there's only voltage at 1 terminal (and no continuity between them) then the switch is faulty and needs stripped or replaced.

3.5) If the voltage at the switch terminals seems good, then you'll have to trace the wiring from there to the starter motor to see if you can find a break in it.

I know that's not the answer that you want to hear, and electrics can seem pretty daunting at first, especially if you don't have a wiring diagram.  But it's either that, or take it to a mechanic and pay him or her to go through the same process.  I do hope it's just a simple wiring fault and that you find and fix it easily.

11
LF250 / Re: Lifan LF 250 workshop manual
« on: May 07, 2010, 02:01:00 PM »
Resurrecting: I've found a Yamaha XV250 manual online.  Doubtless there are others out there.

The good news is that most of it looks like it'll apply to the Lifan.

12
LF250 / Re: Rusty exhaust pipe
« on: May 07, 2010, 05:57:39 AM »
Resurrecting this thread, the exhaust on my 16 month old LF250-B is pretty corroded underneath.  It's been stored outside and ridden in winter (aaargh, road salt) but I'm still surprised: I suspect there's little or no coating on the unchromed parts of the exhaust.  It's definitely something to keep on top of.

13
LF250 / Re: Iridium spark plug
« on: May 07, 2010, 05:54:52 AM »
I've just switched to CR6HIX plugs today, and the bike feels a little happier, with smoother acceleration from low revs.  There could be other factors, but I'd suggest going CR6HIX rather than CR7HIX at least on short acquaintance.

14
Chit Chat / Re: help please
« on: May 02, 2010, 02:02:19 PM »
Is that a LF250 / LF250-B?  It's a cruiser, so the front end should be quite soft.

I'm not sure what you mean by shaky and loose.  If there's any wobble or vibration, then the forks may be bent or not attached securely at the top, or the front axle may be loose.

If the bike dives hard, or doesn't feel damped when it rebounds, then thicker oil might help.  On the other hand, it could just be that some of the oil has leaked out; is there any evidence of oil leaking from around the seals at the bottom of the forks?

Conceivably the springs have snapped.  Or they may simply be too soft for the bike.  You can pre-load them: there's a tensioning insert inside the top of the fork, basically a steel tube that pre-compresses the spring.  You can replace them with longer tubes to compress the spring more.

I'm sorry that I can't be more specific, sight unseen.  This is one of these things that needs some investigation.  Do you have a friend with some bike experience who can look at it for you, and narrow down the cause?

15
LF400 / Re: Lifan LF 400
« on: May 01, 2010, 02:39:04 AM »
Seeing one is easy; just find a Yamaha Virago XV535.  The LF400 is a straight copy of the (rare) sleeved 400cc version, shaft drive and all.

I say "copy", but I suspect Lifan bought the Virago jigs when Yamaha stopped making it, so for all practical purposes the LF400 is a Virago.  I'd bet beer tokens that you could drop 535 pistons and barrels right in.

The exhaust is catalysed to meet Euro 3 requirements, and the ignition and carburettor may also be tweaked, but in looks and riding it's Virago all the way.

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